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--- door_access_controllers [2023-04-08 09:55] – tim
+++ door_access_controllers [2023-04-08 10:24] (current) – [PCB ESP32 (draft)] tim
@@ Line 73: / Line 73: @@
 | U3 | ESP-12E or ESP-12F |
 | U4 | SPX3819M5-L-3-3/TR |
+===== PCB ESP32 (draft) =====
+This is draft design for migrating to ESP32.
+Goals:
+  * ESP32 series
+  * compatibility with existing wiring
+  * fit into the existing plastic enclosures
+  * nice to haves:
+    * fit existing enclosures better
+    * make wiring easier
+{{:20230407_doorman_esp32.pdf?direct&200|schematic}}
+{{:20230407_doorman_esp32.png?direct&200|}} \\
+(placement and routing isn't finished)
+What's changed:
+  * PCB is bigger, designed to screw into the enclosure as the manufacturer intended
+  * Uses the ESP32-S3-WROOM-1 module
+    * available with large flash/ram
+    * supports circuitpython
+    * supports native USB
+  * USB-C connector (plus optional UART pinout for low-level debugging)
+  * Pluggable 3.5mm terminal blocks for easier wiring (can be replaced with fixed blocks to reduce costs)
+  * MOSFET instead of relay (smaller, cheaper, probably more reliable)
+  * Dropped the PN532 reset pin in favour of a switchable power output (one less wire to manage)
+  * Reader connector has spare pins for existing LED and buzzer, but future readers can be I2C only for even less wiring
+  * Onboard RGB LED (will use with a light-pipe to eliminate the wiring for the current LED)
+  * Onboard buzzer
+  * Exit/Snib/Door inputs replaced with 4 general purpose I/O
+  * One I/O also has a power pin (e.g. to run the touch door handle)
+  * Optional Stemma QT (I2C) connector
 ===== Controller Unit =====